org.wicketTutorial.behaviors.OnChangeSingleChoiceBehavior.java Source code

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Here is the source code for org.wicketTutorial.behaviors.OnChangeSingleChoiceBehavior.java

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/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.wicketTutorial.behaviors;

import java.util.List;

import org.apache.wicket.Application;
import org.apache.wicket.Component;
import org.apache.wicket.RequestListenerInterface;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.behavior.IBehaviorListener;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.html.form.AbstractSingleSelectChoice;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.request.IRequestParameters;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.request.resource.ResourceReference;
import org.apache.wicket.util.lang.Args;
import org.apache.wicket.util.string.StringValue;

import sun.reflect.ReflectionFactory.GetReflectionFactoryAction;

public class OnChangeSingleChoiceBehavior extends Behavior implements IBehaviorListener {
    private AbstractSingleSelectChoice boundComponent;

    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        super.renderHead(component, response);
        Application app = Application.get();
        ResourceReference jqReference = app.getJavaScriptLibrarySettings().getJQueryReference();

        response.render(JavaScriptHeaderItem.forReference(jqReference));
    }

    @Override
    public final void bind(final Component hostComponent) {
        Args.notNull(hostComponent, "hostComponent");

        if (boundComponent != null) {
            throw new IllegalStateException("this kind of handler cannot be attached to "
                    + "multiple components; it is already attached to component " + boundComponent
                    + ", but component " + hostComponent + " wants to be attached too");
        }

        if (!(hostComponent instanceof AbstractSingleSelectChoice)) {
            throw new IllegalStateException("This behavior must be attached to AbstractSingleSelectChoice"
                    + " component, but component " + hostComponent + " is not one of those");
        }

        boundComponent = (AbstractSingleSelectChoice) hostComponent;

    }

    @Override
    public void onComponentTag(Component component, ComponentTag tag) {
        super.onComponentTag(component, tag);

        CharSequence callBackURL = getCallbackUrl();
        String separatorChar = (callBackURL.toString().indexOf('?') > -1 ? "&" : "?");

        String finalScript = "var isSelect = $(this).is('select');\n" + "var component;\n" + "if(isSelect)\n"
                + "   component = $(this);\n" + "else \n" + "   component = $(this).find('input:radio:checked');\n"
                + "window.location.href='" + callBackURL + separatorChar + "choiceId=' + " + "component.val()";

        tag.put("onchange", finalScript);
    }

    public CharSequence getCallbackUrl() {
        if (boundComponent == null) {
            throw new IllegalArgumentException("Behavior must be bound to a component to create the URL");
        }

        final RequestListenerInterface rli;

        rli = IBehaviorListener.INTERFACE;

        return boundComponent.urlFor(this, rli, new PageParameters());
    }

    protected Object convertChoiceIdToChoice(String id) {
        final List choices = boundComponent.getChoices();
        final IChoiceRenderer renderer = boundComponent.getChoiceRenderer();

        for (int index = 0; index < choices.size(); index++) {
            final Object choice = choices.get(index);
            if (renderer.getIdValue(choice, index).equals(id)) {
                return choice;
            }
        }
        return null;
    }

    @Override
    public void onRequest() {

        Request request = RequestCycle.get().getRequest();
        IRequestParameters requestParameters = request.getRequestParameters();
        StringValue choiceId = requestParameters.getParameterValue("choiceId");

        boundComponent.setDefaultModelObject(convertChoiceIdToChoice(choiceId.toString()));
    }

    protected Component getComponent() {
        return boundComponent;
    }
}